Composition of matter to be used for making acid-proof cement.



COATING R PLASTIC.

A c H P90 0 F Ehi rfxami MIXES @Q U JSIO 71+]; [PESlDl/E CGMB-III/EZSUNITED STATES PATENT OFFICE.

HEINRICH KAYSEB, OE DARMSTADT, GERMANY.

COMPOSITION OF MATTER TO BE USED FOR MAKING ACID-PROOF CEMENT.

No Drawing.

Patented July 12, 1910.

To all whom it may concern:

Be it known that I, HEINRICH KAYSER, a

subject of the German Emperor, and resident of Darmstadt, German haveinvented a new and Useful Composition of Matter to be Used for MakingAcid-Proof Cement, of which the following is a specification.

In the employment .of Portland cement for cement and concreteconstructions the drawback occurs that the Portland-cement is stronglydecomposed when coming in touch with acids, especially with sulfuricacid. Said drawback results from the presence in the cement mortar of asurplus of calcium hydroxid or of carbonate of calcium which ingredientsunder the influence of acids are converted into soluble salts wherebythe firmness of the mortar is decreased. If these salts are washed-ofiby water, the mortar or concrete loses still more of its firmness.

The resent invention consists in that to proved composition 0 matter.The abovedefined agent is added to the ordinary Portland-cement in drycondition and in qu'antlies o 30 parts of weight of the ocment, saidquantity depending on the purpose for which the cement is intended andon the firmness required. B the addition 9 f the agent named, uponcomBmm art of the surplus oflime 1s convertecF 1n so u e aming compoundsand the formation of the above-mentioned soluble salts is reduced to aconsiderable de rec. In this way the cement mortar gains rmness andbecomes acidproof.

Ha fully described my invention, what I aim and desire to secure byLetters Patent is:--

The herein described composition of matter for making acidproof cement,consistin of finished Portland-cement and the sillcium-containin wasteroducts of the manufacture of sul iate of a umina (SiO,Al O in drycondition and in quantities of up to 30 arts of weight of the cement,substantia y as described.

In testimony whereof I have hereunto set my hand in the presence of twosubscribing witnesses.

HEINRICH KAYSER. Witnesses:

Wmannu Barium, WALTER Hansen.

